Search for a light neutral boson in nuclear transitions

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Presentation transcript:

Search for a light neutral boson in nuclear transitions Attila Krasznahorkay, F.W.N. de Boer, M. Csatlós, L. Csige, Z. Gácsi, J. Gulyás, M. Hunyadi, T.J. Ketel, A. Krasznahorkay Jr., R.G. Lovas, B.M. Nyakó, L. Stuhl, T. Tornyi, J. Van Klinken

Review of Particle Physics, Phys. Lett. B592 (2004) F.W.N. de Boer, R. van Dantzig, Phys. Rev. Lett. 61 (1988) 1274 F.W.N. de Boer et al., J. Phys. G 27 (2001) L29 Report in Science Review of Particle Physics, Phys. Lett. B592 (2004) Gauge & Higgs Boson Particle Listings Axion and Other Light Boson Searches in Nuclear Transitions

INTEGRAL satellite

Creation and decay of a boson Ji e– Ji

Search for a Massive Shortlived Axion in Nuclear Transitions Athans Hatzikoutelis (Advisor: Peter Paul, RHIC Nov. 15, 2003) The Axion is the Goldstone boson that corrects the Strong CP Problem in the Standard Model. The search for axions is continuing for 20 years. If axion exists it can be produced in nuclear transitions of magnetic dipole character from excited states to the ground state of the 12C and 8Be nuclei. 12C 8Be e+ e- Axion b- g 15.1 MeV 17.6 MeV Made by Aqans The Giant Dipole Resonance group is searching for the axions through their decay into electron-positron pairs. A semispherical array of 65 scintillator detectors in coincidence with 4 neutron detectors can resolve pairs.

e+e- pairs from a magnetic monopole 0-  0+ transition

Investigate the 00+ transition in 16O! Axion: L=0, U-boson: L=1 decay

We have used the 14N(3He,p)16O reaction Large cross-section for the 0 state. E= 2.4 MeV 3He is sufficient. Large Q value (15 MeV) Absorbent foil + proton-detector →clean! target: TaN 4 mg/cm2 on 5 μm Ta Beam: 0.5 μA (limited by the target)

The γ-e+-e -p coincidence setup

e+e- angular correlation for the 10.95 MeV transition

Building a new electron-positron spectrometer

Participants (and Walter Henning) of the experiment

Block diagram of the electronics

A new spectrometer was constructed Dark2012, Frascati

γ and e+e- sum energy spectra measured with the improved setup Dark2012, Frascati

The obtained flat angular correlation

γ-spectrum from the decay of the Ex=11 MeV region

e+e- or γγ energy correlations?

Reinvestigation of the 17.6 MeV M1 transition in 8Be Dark2012, Frascati

Energy levels and transitions in 8Be

High energy γ-spectrum measured with the Clover detector

e+e- sum energy spectrum Dark2012, Frascati

The first positive results

The efficiency calibration is crucial Dark2012, Frascati

Some real deviation from the IPC theoretical predictions

Mixing up direct E1 capture events Dark2012, Frascati

Let us concentrate on the isoscalar 1.04 MeV M1 transition in 8Be Dark2012, Frascati

The boson showed up with an energy of 13.5±0.25 MeV (≈3σ confidence) Dark2012, Frascati

A Compact Positron Electron spectrometer (COPE) for internal pair creation studies (ENSAR support) B Beam COPE 100:1 ATLAS GEM detectors, µ-TPC technology for particle tracking, DSP cards for readout.

On the construction of the spectrometer Dark2012, Frascati

Thank you very much for your attention